CVE-2019-18336

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-03-10 · updated 2026-06-17
Weakness: CWE-400

Description

A vulnerability has been identified in SIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants) (All versions < V3.X.17), SIMATIC TDC CP51M1 (All versions < V1.1.8), SIMATIC TDC CPU555 (All versions < V1.1.1), SINUMERIK 840D sl (All versions < V4.8.6), SINUMERIK 840D sl (All versions < V4.94). Specially crafted packets sent to port 102/tcp (Profinet) could cause the affected device to go into defect mode. A restart is required in order to recover the system. Successful exploitation requires an attacker to have network access to port 102/tcp, with no authentication. No user interation is required. At the time of advisory publication no public exploitation of this security vulnerability was known.

Affected products

Siemens Simatic S7-300 Cpu 312 Ifm Firmware: before 3.3.17 — fixed in 3.3.17
Siemens Simatic S7-300 Cpu 313 Firmware: before 3.3.17 — fixed in 3.3.17
Siemens Simatic S7-300 Cpu 314 Firmware: before 3.3.17 — fixed in 3.3.17
Siemens Simatic S7-300 Cpu 314 Ifm Firmware: before 3.3.17 — fixed in 3.3.17
Siemens Simatic S7-300 Cpu 315-2 Dp Firmware: before 3.3.17 — fixed in 3.3.17
Siemens Simatic S7-300 Cpu 315 Firmware: before 3.3.17 — fixed in 3.3.17
Siemens Simatic S7-300 Cpu 316-2 Dp Firmware: before 3.3.17 — fixed in 3.3.17
Siemens Simatic S7-300 Cpu 318-2 Firmware: before 3.3.17 — fixed in 3.3.17
Siemens Simatic S7-300 Cpu Firmware: before 3.3.17 — fixed in 3.3.17
Siemens AG SIMATIC TDC CP51M1: before 1.1.8 — fixed in 1.1.8
Siemens Simatic Tdc Cpu555 Firmware: before 1.1.1 — fixed in 1.1.1
Siemens SINUMERIK 840D sl: before 4.8.6; before 4.94 — fixed in 4.8.6, 4.94

How to fix

Upgrade to a fixed version: Siemens Simatic S7-300 Cpu 312 Ifm Firmware 3.3.17; Siemens Simatic S7-300 Cpu 313 Firmware 3.3.17; Siemens Simatic S7-300 Cpu 314 Firmware 3.3.17; Siemens Simatic S7-300 Cpu 314 Ifm Firmware 3.3.17; Siemens Simatic S7-300 Cpu 315-2 Dp Firmware 3.3.17; Siemens Simatic S7-300 Cpu 315 Firmware 3.3.17; Siemens Simatic S7-300 Cpu 316-2 Dp Firmware 3.3.17; Siemens Simatic S7-300 Cpu 318-2 Firmware 3.3.17; Siemens Simatic S7-300 Cpu Firmware 3.3.17; Siemens AG SIMATIC TDC CP51M1 1.1.8; Siemens Simatic Tdc Cpu555 Firmware 1.1.1; Siemens SINUMERIK 840D sl 4.8.6, 4.94. Check the vendor advisory for mitigations.

References

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